Reconfigurable intelligent surfaces (RISs) are an emerging transmission technology for application to wireless communications. Their accurate modeling is crucial for an effective design. In this work, a time domain modeling is proposed that comprises two steps: first the impulse response of the system is computed using the partial element equivalent circuit method thus including all the couplings among the elements of the RIS, then the communication channel is studied through a convolution-based solver in the time domain.
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